CN110612508B - Touch controller, demodulation method and touch system - Google Patents
Touch controller, demodulation method and touch system Download PDFInfo
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- CN110612508B CN110612508B CN201880000106.8A CN201880000106A CN110612508B CN 110612508 B CN110612508 B CN 110612508B CN 201880000106 A CN201880000106 A CN 201880000106A CN 110612508 B CN110612508 B CN 110612508B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/047—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires
Abstract
A touch controller (16) includes a signal generation moduleA block (12) coupled to a plurality of transfer electrodes (TE 1 ～TE M ) For outputting a first transmission signal to a first transmission electrode (TE a ) And simultaneously outputs a second transmission signal to a second Transmission Electrode (TE) b ) Wherein the first transmission signal has a first phase and the second transmission signal has a second phase; and a demodulation module (14) coupled to the plurality of Receiving Electrodes (RE) 1 ～RE N ) For receiving the electric power from the plurality of receiving electrodes to a Receiving Electrode (RE) n ) Is a received signal (RX n ) A first amplitude (A) corresponding to the first phase and a second amplitude (B) corresponding to the second phase in the received signal are calculated.
Description
Technical Field
The present disclosure relates to touch controllers, demodulation methods, and touch systems, and more particularly, to a touch controller, a demodulation method, and a touch system capable of reducing signal bandwidth.
Background
With the increasing progress of technology, the operation interfaces of various electronic products are becoming humanized in recent years. For example, through the touch panel, the user can directly operate on the screen with a finger or a stylus to input information/text/patterns, thereby saving the trouble of using input devices such as a keyboard or keys. In practice, the touch screen is generally composed of a sensing panel and a display disposed behind the sensing panel. The electronic device judges the meaning of the touch according to the touch position of the user on the sensing panel and the picture presented by the display at the moment, and executes the corresponding operation result.
The prior touch control technology has been developedSimultaneously (at the same time) two signals with different frequencies and orthogonal to each other are utilized to code (i.e. transmit two signals to two electrodes) two transmission electrodes of the touch control system, and the signals carried by the different frequencies can be distinguished in the demodulation process because the code-coded signals are mutually orthogonal to each other. FIG. 7 shows two mutually orthogonal signal spectrums with frequencies f a F b The signal frequencies of the two corresponding mutually orthogonal signals need to be kept at a specific frequency interval to maintain the mutually orthogonal characteristics. However, if two or more signals orthogonal to each other are transmitted, the bandwidth occupied by the signals (signal bandwidth for short) is large, and it is necessary to ensure that no other interference exists in the signal bandwidth, which increases the difficulty of touch system design.
Therefore, how to reduce the bandwidth of signals while simultaneously transmitting multiple signals to multiple electrodes is one of the goals of the industry.
Disclosure of Invention
Accordingly, some embodiments of the present application provide a touch controller, a demodulation method and a touch system with reduced signal bandwidth, so as to improve the drawbacks of the prior art.
In order to solve the above-mentioned problems, an embodiment of a touch controller includes a signal generating module, coupled to a plurality of transmission electrodes of a touch panel, for outputting a first transmission signal to a first transmission electrode of the plurality of transmission electrodes and outputting a second transmission signal to a second transmission electrode of the plurality of transmission electrodes at the same time, wherein the first transmission signal has a first phase, and the second transmission signal has a second phase different from the first phase; the demodulation module is coupled to the plurality of receiving electrodes of the touch panel and is used for receiving a receiving signal of a receiving electrode of the plurality of receiving electrodes and calculating a first amplitude corresponding to the first phase and a second amplitude corresponding to the second phase in the receiving signal according to the receiving signal; the first amplitude is used for judging the capacitance between the first transmitting electrode and the receiving electrode, and the second amplitude is used for judging the capacitance between the second transmitting electrode and the receiving electrode.
For example, the signal generating module outputs the first transmission signal to the first transmission electrode at a first time, and the demodulating module receives a first reception signal from a reception electrode of the plurality of reception electrodes at the first time and generates a first component and a second component corresponding to the first reception signal; the signal generating module outputs the second transmission signal to the second transmission electrode at a second time, and the demodulating module receives a second receiving signal from the receiving electrode at the second time and generates a third component and a fourth component corresponding to the second receiving signal; the signal generating module outputs the first transmission signal to the first transmission electrode and simultaneously outputs the second transmission signal to the second transmission electrode at a third time, and the demodulating module receives a third receiving signal from the receiving electrode at the third time and generates a fifth component and a sixth component corresponding to the third receiving signal; and the demodulation module calculates the fifth component and the sixth component according to the first component, the second component, the third component and the fourth component so as to calculate the first amplitude corresponding to the first phase and the second amplitude of the second phase in the third received signal.
For example, the demodulation module is configured to perform the following steps to calculate the first amplitude corresponding to the first phase and the second amplitude corresponding to the second phase in the third received signal by performing an operation on the fifth component and the sixth component according to the first component, the second component, the third component, and the fourth component: calculating a first receiving phase angle corresponding to the first transmitting electrode and the receiving electrode according to the first component and the second component; calculating a second receive phase angle corresponding to between the second transmit electrode and the receive electrode according to the third component and the fourth component; performing a coordinate rotation operation on a first coordinate related to the second receiving phase angle to obtain a seventh component of a second coordinate, wherein the first coordinate is formed by the fifth component and the sixth component, and the seventh component is a component of the second coordinate in a first dimension; performing a coordinate rotation operation on the first coordinate with respect to the first receiving phase angle to obtain an eighth component of a third coordinate, wherein the eighth component is a component of the third coordinate in a second dimension, and the first dimension is orthogonal to the second dimension; and obtaining the first amplitude from the seventh component and the second amplitude from the eighth component.
For example, the demodulation module includes a coordinate rotation digital calculator for performing the following steps using a coordinate rotation digital algorithm: calculating a phase angle corresponding to the first reception phase from the first component and the second component; calculating a second received phase angle corresponding to the third component from the fourth component; performing a coordinate rotation operation on the first coordinate with respect to the second reception phase angle to obtain the seventh component of the second coordinate; and performing a coordinate rotation operation on the first coordinate with respect to the first reception phase angle to obtain the eighth component of the third coordinate.
For example, the demodulation module is configured to perform the following steps, according to the first component, the second component, the third component, and the fourth component, to calculate the first amplitude corresponding to the first phase and the second amplitude corresponding to the second phase in the third received signal by performing an operation on the fifth component and the sixth component: forming a decoding matrix according to the first component, the second component, the third component and the fourth component: forming a first vector according to the fifth component and the sixth component; multiplying the coding matrix by the first vector to obtain a second vector; and obtaining the first amplitude and the second amplitude according to a second vector.
For example, the decoding matrix is proportional to
Wherein I is A Representing the first component, Q A Representing the second component, I B Representing the third component, Q B Representing the fourth component.
For example, the first component is an in-phase component of the first received signal, the third component is an in-phase component of the second received signal, the fifth component is an in-phase component of the third received signal, the second component is a quadrature component of the first received signal, the fourth component is a quadrature component of the second received signal, and the sixth component is a quadrature component of the third received signal.
For example, the first component is a component of the first received signal corresponding to the first phase, the third component is a component of the second received signal corresponding to the first phase, the fifth component is a component of the third received signal corresponding to the first phase, the second component is a component of the first received signal corresponding to the second phase, the fourth component is a component of the second received signal corresponding to the second phase, and the sixth component is a component of the third received signal corresponding to the second phase.
The embodiment of the application further provides a demodulation method applied to a touch controller in a touch system, wherein the touch controller comprises a signal generation module and a demodulation module, and the demodulation method comprises the following steps: outputting a first transmission signal to a first transmission electrode of a plurality of transmission electrodes of a touch panel and outputting a second transmission signal to a second transmission electrode of the plurality of transmission electrodes at the same time, wherein the first transmission signal has a first phase and the second transmission signal has a second phase; and a receiving signal received from a receiving electrode of the plurality of receiving electrodes of the touch panel, and calculating a first amplitude corresponding to the first phase and a second amplitude corresponding to the second phase in the receiving signal according to the receiving signal; the first amplitude is used for judging the capacitance between the first transmitting electrode and the receiving electrode, and the second amplitude is used for judging the capacitance between the second transmitting electrode and the receiving electrode.
The embodiment of the application further provides a touch system, including: the touch panel comprises a plurality of transmission electrodes and a plurality of receiving electrodes; the touch controller comprises a signal generating module, a first signal generating module and a second signal generating module, wherein the signal generating module is coupled with the plurality of transmission electrodes of the touch panel and is used for outputting a first transmission signal to a first transmission electrode of the plurality of transmission electrodes and outputting a second transmission signal to a second transmission electrode of the plurality of transmission electrodes at the same time, and the first transmission signal has a first phase and the second transmission signal has a second phase different from the first phase; the demodulation module is coupled to the plurality of receiving electrodes of the touch panel and is used for receiving a receiving signal of a receiving electrode of the plurality of receiving electrodes and calculating a first amplitude corresponding to the first phase and a second amplitude corresponding to the second phase in the receiving signal according to the receiving signal; the first amplitude is used for judging the capacitance between the first transmitting electrode and the receiving electrode, and the second amplitude is used for judging the capacitance between the second transmitting electrode and the receiving electrode.
The embodiment of the application demodulates the non-orthogonal transmission signals by utilizing the decoding matrix to calculate the energy corresponding to a plurality of transmission signals and judge the coordinates of the occurrence of the touch event. Compared with the prior art, the method has the advantage of smaller signal frequency bands.
Drawings
FIG. 1 is a schematic diagram of a touch system according to an embodiment of the disclosure;
fig. 2 is a schematic diagram of a demodulation module according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of a plurality of coordinates according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a decoding unit according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a process according to an embodiment of the present application;
fig. 6 is a schematic diagram of a demodulation module according to an embodiment of the disclosure;
fig. 7 is a spectrum of two mutually orthogonal signals.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The present application uses two transmission signals of the same frequency but different phases to code two transmission electrodes, and can successfully demodulate two amplitudes corresponding to the two transmission signals (different phases) without adding extra bandwidth.
Specifically, referring to fig. 1, fig. 1 is a schematic diagram of a touch system 10 according to an embodiment of the disclosure. The touch system 10 includes a touch panel 18 and a touch controller 16, wherein the touch panel 18 includes a transmission electrode TE 1 ～TE M Receiving electrode RE 1 ～RE N The touch controller 16 includes a signal generation module 12 and a demodulation module 14. The signal generating module 12 is coupled to the transmission electrode TE 1 ～TE M The demodulation module 14 is coupled to the receiving electrode RE 1 ～RE N . Transfer electrode TE 1 ～TE M Receiving electrode RE 1 ～RE N Can be arranged on a display screen. The signal generating module 12 can output a first transmission signal TX a To the transfer electrode TE 1 ～TE M A first transfer electrode TE of (a) a And simultaneously outputs a second transmission signal TX b To the transfer electrode TE 1 ～TE M A second transfer electrode TE b . Wherein the first transmission signal TX a And a second transmission signal TX b Signals which may have the same frequency but different phases, that is, the first transmission signal TX a May have a frequency f c First phase theta a A second transmission signal TX b May have a frequency f c Second phase θ b And a first phase theta a And a second phase theta b Different.The demodulation module 14 can receive the receiving electrode RE at a time according to a specific time sequence 1 ～RE N One of which receives the received signal of the electrode. For convenience of explanation, the receiving electrode RE will be received for the demodulation module 14 1 ～RE N One of the receiving electrodes RE n Is a received signal RX of (2) n Illustratively, the demodulation module 14 receives a received signal RX n Will then receive the signal RX n Performing demodulation operations, i.e. based on the received signal RX n Calculate and output on the received signal RX n Corresponding to the first phase theta a A first amplitude A and a second phase theta b A second amplitude B of (B). In this way, the touch system 10 can determine the first transmission electrode TE according to the first amplitude a a And receiving electrode RE n Capacitance (or capacitance change) between (formed capacitance node) and determining the second transfer electrode TE according to the second amplitude B b And receiving electrode RE n Capacitance (or capacitance change) therebetween to determine the location of the touch event. In one embodiment, the first transmission signal TX a Can be expressed as TX a ＝sin(2πf c t+θ a ) A second transmission signal TX b Can be expressed as TX b ＝sin(2πf c t+θ b ). However, the demodulation module 14 is not limited to this, and the demodulation module of the present application may receive a plurality of reception signals of a plurality of reception electrodes at a time and perform the same demodulation operation on the plurality of reception signals, and since the principle of performing demodulation operation on the plurality of reception signals is the same as that of performing demodulation operation on a single reception signal, the demodulation module will be described below as an example of receiving one reception signal of one reception electrode at a time and performing demodulation operation on the reception signal.
The touch controller 16 can obtain information related to the phase of the screen body in a Pre-Processing Stage, i.e. obtain phase information related to the transmitting electrode and the receiving electrode in the case of no touch, and receive the touch of the user in a touch detection Stage (Touch Sensing Stage), at this time, the touch controller 16 can perform demodulation operation by the demodulation module 14 according to the screen body phase information. The touch system 10 can determine the position of the touch event according to the demodulation result. In one embodiment, the touch system 10 may perform the operation of acquiring the information related to the screen phase in the pre-stage before the product leaves the factory or in a Calibration (Calibration) stage of the touch system 10.
In detail, a first time T in the pre-stage 1 The signal generating module 12 generates only the first transmission signal TX a Output to the first transfer electrode TE a The demodulation module 14 receives the first time T 1 And at the receiving electrode RE n Receiving a received signal RX n,1 In which the signal RX is received n,1 Is represented by a first time T 1 Demodulation module 14 is arranged on the receiving electrode RE n Received signal RX n The demodulation module 14 generates a received signal RX n,1 A first component and a second component, at this time (first time T 1 ) Received signal RX n,1 Is related to the first transmission electrode TE a And receiving electrode RE n The phase therebetween (i.e., the first phase in the following). A second time T in the pre-stage 2 The signal generating module 12 only transmits the second transmission signal TX b Output to the second transfer electrode TE b The demodulation module 14 receives the first time T 2 And at the receiving electrode RE n Receiving a received signal RX n,2 In which the signal RX is received n,2 Represented by the second time T 2 Demodulation module 14 is arranged on the receiving electrode RE n Received signal RX n The demodulation module 14 generates a received signal RX n,2 A third component and a fourth component, at this time (second time T 2 ) Received signal RX n,2 The third and fourth components of (2) are related to the second transfer electrode TE b And receiving electrode RE n The phase in between (i.e., the second shield phase). In the touch detection stage (or at a third time T 3 ) The signal generating module 12 simultaneously generates the first transmission signal TX a Output to the first transfer electrode TE a And will be the firstTwo transmit signals TX b Output to the second transfer electrode TE b The demodulation module 14 receives the first signal at the third time T 3 And at the receiving electrode RE n Receiving a received signal RX n,3 In which the signal RX is received n,3 Represented by a third time T 3 Demodulation module 14 is arranged on the receiving electrode RE n Received signal RX n The demodulation module 14 generates a received signal RX n,3 A fifth component and a sixth component. The demodulation module 14 calculates the fifth component and the sixth component according to the first component, the second component, the third component and the fourth component to calculate a received signal RX n,3 Corresponding to the first phase theta a First amplitude a and second phase θ of (a) b Is set to the second amplitude B of (c).
Mathematically, the received signal RX n,1 Can be expressed as RX n,1 ＝K·sin(2πf c t+θ a +θ α ) Wherein the first screen phase theta α Representing the first transfer electrode TE a And receiving electrode RE n Phase therebetween, i.e. shield phase θ α For transmitting signal TX a (transmit signal TX) a Is a sine Wave signal (Sinussoidal Wave) and is proportional to sin (2pi f) c t+θ a ) Is associated with the received signal RX n,1 (received Signal RX n,1 Is a sine wave signal and is proportional to sin (2 pi f) c t+θ a +θ α ) A) a phase difference between them. In addition, receive signal RX n,2 Can be expressed as RX n,1 ＝K·sin(2πf c t+θ b +θ β ) Second screen phase θ β Representing the second transfer electrode TE b And receiving electrode RE n Phase between, i.e. transmit signal TX b (transmit signal TX) b Is a sine wave signal and is proportional to sin (2 pi f) c t+θ b ) Is associated with the received signal RX n,2 (received Signal RX n,2 Is a sine wave signal and is proportional to sin (2 pi f) c t+θ b +θ β ) A) where K represents the received signal RX) n,1 、RX n,2 Is set, is a constant value, and is a constant value. In addition, receive signal RX n,3 Can be expressed as RX n,3 ＝A·sin(2πf c t+θ a +θ α )+B·sin(2πf c t+θ b +θ β ) Wherein A, B represents the received signal RX n,3 Respectively corresponding to phase theta a 、θ b Is set, is a constant value, and is a constant value.
Referring to fig. 2, fig. 2 is a schematic diagram of a demodulation module 24 according to an embodiment of the present application. Demodulation module 24 may be used as a specific implementation of demodulation module 14. Demodulation module 24 includes a mixing and integrating unit 240 and a Decoding unit 242. The mixer integrator 240 includes mixers MX1 and MX2 and integrators INT1 and INT2, and the mixers MX1 and the integrators INT1 are used to utilize the local signal sin2 pi f c t pairs of received signals RX n Mixing and integrating to output a received signal RX n The mixer MX2 and the integrator INT2 are used to utilize the local signal cos2 pi f c t pairs of received signals RX n Mixing and integrating to output a received signal RX n Is a component (Quadrature Component) of the orthogonal component(s).
In this case, the mixer integrator 240 may generate the received signal RX n,1 Is a component I of a common direction of the (1) A (which may correspond to the first component of the claims) and a quadrature component Q A (which may correspond to the second component in the claims), a received signal RX n,2 Is a component I of a common direction of the (1) B (which may correspond to the third component of the claims) and a quadrature component Q B (which may correspond to the fourth component in the claims) and a received signal RX n,3 Is a component I of a common direction of the (1) C (which may correspond to the fifth component of the claims) and a quadrature component Q C (which may correspond to the sixth component in the claims). In one embodiment, the component I is A Can be represented as I A ＝(KT/2)·cos(θ a +θ α ) Where T represents the integration interval of the integrators INT1, INT2, quadrature component Q A Can be expressed as Q A ＝(KT/2)·sin(θ a +θ α ) Component I in the same direction B Can be represented as I B ＝(KT/2)·cos(θ b +θ β ) Quadrature component Q B Can be expressed as Q B ＝(KT/2)·sin(θ b +θ β ) Equidirectional divisionQuantity I C Can be represented as I C ＝(AT/2)·cos(θ a +θ α )+(BT/2)·cos(θ b +θ β ) (equation 1), quadrature component Q C Can be expressed as Q C ＝(AT/2)·sin(θ a +θ α )+(BT/2)·sin(θ b +θ β ) (equation 2).
In a first embodiment, the decoding unit 242 can calculate θ first a +θ α For theta a +θ α ＝tan -1 (Q A /I A ) (equation 3) and calculating θ b +θ β ＝tan -1 (Q B /I B ) (equation 4), in other words, the decoding unit 242 according to the same-directional component I A (first component) and quadrature component Q A (second component) calculation corresponds to the first transfer electrode TE a And receiving electrode RE n A first receiving phase angle theta between A And according to the same direction component I B (third component) and quadrature component Q B (fourth component) calculation corresponds to the second transfer electrode TE b And receiving electrode RE n A second receiving phase angle theta therebetween B Wherein θ is A For theta A ＝θ a +θ α ，θ B For theta B ＝θ b +θ β . Meanwhile, the decoding unit 242 may decode the same-directional component I C (fifth component) and quadrature component Q C (sixth component) to form a first coordinate (I) C ,Q C ) Wherein I C Can be regarded as a first coordinate (I C ,Q C ) In a transverse dimension, Q C Can be regarded as a first coordinate (I C ,Q C ) A component in a longitudinal dimension.
The decoding unit 242 may decode the first coordinate (I C ,Q C ) Performing correlation with the second receiving phase angle theta B To obtain a second coordinate (I C (2) ,Q C (2) ) And according to the second coordinates (I C (2) ,Q C (2) ) Component Q in the longitudinal dimension C (2) (which may correspond to the seventh component in the claims) to obtain a first amplitude a. On the other hand, the decoding unit 242 can be applied to the first coordinate (I C ,Q C ) Performing a correlation with the first receiving phase angle theta A To obtain a third coordinate (I C (3) ,Q C (3) ) And according to the third coordinate (I C (3) ,Q C (3) ) Component I in the transverse dimension C (3) (corresponding to the eighth component in the claims) to obtain a second amplitude B.
In detail, please refer to fig. 3, fig. 3 is a first coordinate (I C ,Q C ) Second coordinates (I C (2) ,Q C (2) ) And third coordinates (I C (3) ,Q C (3) ) Schematic in a coordinate plane. As shown in FIG. 3 (a), due to the homodromous component I C Quadrature component Q C Can be expressed as formula 1 and formula 2, the first coordinate (I C ,Q C ) Can be regarded as a vector V A (AT/2)·cosθ A ,(AT/2)·sinθ A ) With another vector V B Wherein, as shown in fig. 3 (a) in fig. 3, the vector V A Can be expressed as ((AT/2) cos θ) A ,(AT/2)·sinθ A ) Vector V B Can be expressed as ((BT/2) cos θ) B ,(BT/2)·sinθ B ). As shown in fig. 3 (b), when the decoding unit 242 decodes the first coordinate (I C ,Q C ) To rotate anticlockwise (pi-theta) B ) Thereafter, vector V in FIG. 3 (a) B Will overlap with the transverse dimension, and the first coordinate (I C ,Q C ) Rotated counterclockwise (pi-theta) B ) The second coordinate (I C (2) ,Q C (2) ) Component Q in the longitudinal dimension C (2) Can be expressed as (AT/2). Sin (θ) B -θ A ) Thus, the decoding unit 242 may be based on the component Q C (2) The first amplitude a is obtained. On the other hand, as shown in fig. 3 (c), when the decoding unit 242 decodes the first coordinate (I C ,Q C ) Make clockwise rotation (pi/2+theta) A ) Thereafter, vector V in FIG. 3 (a) A Will overlap with the longitudinal dimension, and the first coordinate (I C ,Q C ) Rotated clockwise (pi/2+theta) A ) The third coordinate (I) C (3) ,Q C (3) ) Component I in the transverse dimension C (3) Can be expressed as (BT/2). Sin (θ) B -θ A ) Thus, the decoding unit 242 may be based on component I C (3) The second amplitude B is obtained. Wherein the transverse dimension is mutually orthogonal (Mutually Orthogonal) to the longitudinal dimension.
Preferably, the signal generating module 12 can adjust the phase θ a 、θ b So that θ B -θ A Pi/2, thus, component Q C (2) Is Q C (2) =at/2 and component I C (3) Is I C (3) Since the integration interval T is known, =bt/2, the decoding unit 242 can determine the component Q C (2) 、I C (3) Amplitude A, B was obtained.
In one embodiment, the decoding unit 242 may include a coordinate rotation digital calculator (Coordinate Rotation Digital Computer, CORDIC) 2420, as shown in fig. 4, the coordinate rotation digital calculator 2420 is used to perform the operation of a coordinate rotation digital Algorithm (CORDIC Algorithm), and the decoding unit 242 may utilize the coordinate rotation digital calculator 2420 to perform the operations of the formula 3 and the formula 4 (i.e. perform tan -1 Is a function operation of (c). Regarding tan using coordinate rotation digital algorithm -1 The details of the function operation of (a) are known to those of ordinary skill in the art, and are not described herein.
On the other hand, the coordinate rotation digital calculator 2420 may use a coordinate rotation digital algorithm to calculate the first coordinate (I C ,Q C ) To rotate anticlockwise (pi-theta) B ) To obtain a second coordinate (I C (2) ,Q C (2) ) And is composed of second coordinates (I C (2) ,Q C (2) ) Acquiring component Q C (2) The method comprises the steps of carrying out a first treatment on the surface of the In addition, the coordinate rotation number calculator 2420 may use a coordinate rotation number algorithm to calculate the first coordinate (I C ,Q C ) Make clockwise rotation (pi/2+theta) A ) To obtain a third coordinate (I C (3) ,Q C (3) ) And is composed of third coordinates (I C (3) ,Q C (3) ) Obtaining component I C (3) . In other words, the coordinate rotation digital computer 2420 can be reused without additional circuitry, thereby reducing the circuit area. Details of the coordinate rotation for a specific angle with respect to a specific coordinate using the coordinate rotation digital algorithm are known to those of ordinary skill in the art, and are not described herein.
In addition, the decoding unit 242 is not limited to performing tan -1 Or performing a coordinate rotation operation. In a second embodiment, the decoding unit 242 may perform decoding according to the same-direction component I A (first component), quadrature component Q A (second component), co-directional component I B (third component) and quadrature component Q B (fourth component) to form a decoding matrix D, the same-directional component I C (fifth component) and quadrature component Q C (sixth component) to form a first vector v 1 (wherein the first vector v 1 Can be expressed as v 1 ＝[I C Q C ] T ) And multiplying the decoding matrix D by the first vector v 1 To obtain a second vector v 2 . In detail, the decoding unit 242 may form the decoding matrix D as equation 5 and execute v 2 ＝D v 1 According to the derivation of equation 6 (where θ A ＝θ a +θ α ，θ B ＝θ b +θ β ) The decoding unit 242 may be based on the second vector v 2 Amplitude A, B was obtained.
The operation of the touch controller 16 can be generalized to a process 50, as shown in FIG. 5, the process 50 including the steps of:
step 502: the signal generating module 12 generates a first transmission signal TX a Output to the first transfer electrode TE a And at the same time secondTransmit signal TX b Output to the second transfer electrode TE b Wherein the first transmission signal TX a Having a first phase theta a A second transmission signal TX b With a second phase theta b Wherein the first phase is different from the second phase.
Step 504: the demodulation module 14 receives the receiving electrode RE n Is a received signal RX of (2) n And calculates in the received signal RX n Corresponding to the first phase theta a First amplitude a and corresponding second phase θ of (a) b Is set to the second amplitude B of (c).
For details of the process 50, reference is made to the related paragraphs, and details are not repeated here.
It should be noted that the above embodiments are illustrative of the concept of the present invention, and those skilled in the art can make various modifications without being limited thereto. For example, demodulation module 24 in fig. 2 is configured to receive signal RX n Quadrature demodulation/reception, i.e. mixers MX1, MX2 utilize mutually orthogonal local signals sin2 pi f, respectively c t、cos2πf c t pairs of received signals RX n Mixing is performed and the mixer MX1 uses the local signal to receive the signal RX n Mixing is performed, however, not limited thereto.
Referring to fig. 6, fig. 6 is a schematic diagram of a demodulation module 64 according to another embodiment of the present application. Demodulation module 64 may also be implemented as a particular implementation of demodulation module 14. Demodulation module 64 is similar to demodulation module 24, and like elements share like reference numerals. Unlike the demodulation module 24, the demodulation module 64, i.e., the mixers MX1, MX2, respectively utilize local signals sin (2pi f) that are not necessarily orthogonal to each other c t+θ a )、sin(2πf c t+θ b ) For received signal RX n Mixing is performed. Wherein, when the local signal sin (2 pi f c t+θ a )、sin(2πf c t+θ b ) When the phase difference between the two signals is an integer multiple of 90 DEG, the local signal sin (2pi f c t+θ a )、sin(2πf c t+θ b ) Is orthogonal; while the local signal sin (2 pi f c t+θ a )、sin(2πf c t+θ b ) When the phase difference between them is not an integer multiple of 90 DEG Local signal sin (2 pi f c t+θ a )、sin(2πf c t+θ b ) Is non-orthogonal. In other words, the local signal sin (2 pi f) (utilized by mixers MX1, MX2 in demodulation module 64) c t+θ a )、sin(2πf c t+θ b ) The phase difference between them may not be equal to an integer multiple of 90 °, for example, the local signal sin (2pi.f c t+θ a )、sin(2πf c t+θ b ) The phase difference between the signals can be more than 0 DEG and less than 90 DEG, when the local signal sin (2 pi f c t+θ a )、sin(2πf c t+θ b ) When the phase difference between the two signals is larger than 0 DEG and smaller than 90 DEG, the local signal sin (2 pi f c t+θ a )、sin(2πf c t+θ b ) Is a non-orthogonal signal.
In detail, the mixer MX1 and the integrator INT1 in the mixer-integrator unit 640 of the demodulation module 64 can generate the received signal RX n,1 Is a first component I of A ' the mixer MX2 and the integrator INT2 can generate a receive signal RX n,1 A second component Q of (2) A ' wherein the first component I A ' as received signal RX n,1 Corresponding to the first phase theta a Is represented as component I A ’＝(KT/2)·cosθ α While the second component Q A ' as received signal RX n,1 Corresponding to the second phase theta b Is represented as Q A ’＝(KT/2)·sin(θ a +θ α -θ b ). In addition, the mixer MX1 and the integrator INT1 in the mixer integrator unit 340 can generate the received signal RX n,2 A third component I of (2) B ' the mixer MX2 and the integrator INT2 can generate a receive signal RX n,2 A fourth component Q of (2) B ' wherein the third component I B ' as received signal RX n,2 Corresponding to the first phase theta a Is represented as component I B ’＝(KT/2)·cos(θ b +θ β -θ a ) While the fourth component Q B ' as received signal RX n,2 Corresponding to the second phase theta b Is represented as Q B ’＝(KT/2)·cosθ β . In addition, mixing in mixing integrating unit 340The wave device MX1 and the integrator INT1 can generate a receiving signal RX n,3 A fifth component I of (2) C ' the mixer MX2 and the integrator INT2 can generate a receive signal RX n,3 A sixth component Q of (2) C ' wherein the fifth component I C ' as received signal RX n,3 Corresponding to the first phase theta a Is represented as component I C ’＝(AT/2)·cosθ α +(BT/2)·cos(θ b +θ β -θ a ) While the sixth component Q C ' as received signal RX n,3 Corresponding to the second phase theta b Is represented as Q C ’＝(AT/2)·cos(θ a +θ α -θ b )+(BT/2)·cosθ β . Due to the first component I A ' second component Q A ' third component I B ' fourth component Q B ' fifth component I C ' and sixth component Q C ' have the relationship of formula 7 with each other, so the decoding unit 642 of the demodulation module 64 can calculate the received signal RX in a similar operation to the decoding unit 242 n,3 Corresponding to the first phase theta a First amplitude a and second phase θ of (a) b Is set to the second amplitude B of (c).
In summary, the present application uses a coordinate rotation digital calculator or a decoding matrix to demodulate the first transmission signal and the second transmission signal with the same frequency but different phases, so as to calculate the amplitudes corresponding to the different phases, and determine the coordinates of the occurrence of the touch event. Compared with the prior art, the method has the advantage of smaller signal frequency bands.
The foregoing description of the embodiments is provided for the purpose of illustration only and is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (17)
1. A touch controller, comprising:
the signal generating module is coupled to a plurality of transmission electrodes of a touch panel and is used for outputting a first transmission signal to a first transmission electrode of the plurality of transmission electrodes and outputting a second transmission signal to a second transmission electrode of the plurality of transmission electrodes at the same time in a touch detection stage, wherein the first transmission signal has a first phase, the second transmission signal has a second phase different from the first phase, and the frequencies of the first transmission signal and the second transmission signal are the same; and
the demodulation module is coupled to the plurality of receiving electrodes of the touch panel and is used for receiving a receiving signal of one receiving electrode of the plurality of receiving electrodes and calculating a first amplitude corresponding to the first phase and a second amplitude corresponding to the second phase in the receiving signal according to the receiving signal in the touch detection stage;
The first amplitude is used for judging the capacitance between the first transmitting electrode and the receiving electrode, and the second amplitude is used for judging the capacitance between the second transmitting electrode and the receiving electrode; and
in the pre-stage, the signal generating module outputs the first transmission signal to the first transmission electrode at a first time and does not output any signal to other transmission electrodes except the first transmission electrode in the plurality of transmission electrodes, and the demodulating module receives a first receiving signal of a receiving electrode in the plurality of receiving electrodes at the first time and generates a first component and a second component corresponding to the first receiving signal, wherein the first component and the second component are related to a phase between the first transmission electrode and the receiving electrode; the signal generating module outputs the second transmission signal to the second transmission electrode at a second time and does not output any signal to other transmission electrodes except the second transmission electrode in the plurality of transmission electrodes, and the demodulating module receives a second receiving signal of the receiving electrode at the second time and generates a third component and a fourth component corresponding to the second receiving signal, wherein the third component and the fourth component are related to the phase between the second transmission electrode and the receiving electrode.
2. The touch controller of claim 1, wherein in the touch detection phase, the signal generation module outputs the first transmission signal having a first phase to the first transmission electrode and simultaneously outputs the second transmission signal having a second phase different from the first phase to the second transmission electrode at a third time, and the demodulation module receives a third reception signal of the reception electrode at the third time and generates a fifth component and a sixth component corresponding to the third reception signal; and the demodulation module calculates the fifth component and the sixth component according to the first component, the second component, the third component and the fourth component so as to calculate the first amplitude corresponding to the first phase and the second amplitude of the second phase in the third received signal.
3. The touch controller of claim 2, wherein the demodulation module is configured to perform operations on the fifth component and the sixth component based on the first component, the second component, the third component, and the fourth component to calculate the first amplitude corresponding to the first phase and the second amplitude of the second phase in the third received signal:
Calculating a first receiving phase angle corresponding to the first transmitting electrode and the receiving electrode according to the first component and the second component;
calculating a second receive phase angle corresponding to between the second transmit electrode and the receive electrode according to the third component and the fourth component;
performing a coordinate rotation operation on a first coordinate related to the second receiving phase angle to obtain a seventh component of a second coordinate, wherein the first coordinate is formed by the fifth component and the sixth component, and the seventh component is a component of the second coordinate in a first dimension; performing a coordinate rotation operation on the first coordinate with respect to the first receiving phase angle to obtain an eighth component of a third coordinate, wherein the eighth component is a component of the third coordinate in a second dimension, and the first dimension is orthogonal to the second dimension; and
the first amplitude is obtained from the seventh component, and the second amplitude is obtained from the eighth component.
4. The touch controller of claim 3, wherein the demodulation module comprises:
A coordinate rotation digital calculator for performing the following steps using a coordinate rotation digital algorithm:
calculating the first receive phase angle from the first component and the second component;
calculating the second receive phase angle from the third component and the fourth component;
performing a coordinate rotation operation on the first coordinate with respect to the second reception phase angle to obtain the seventh component of the second coordinate; and
and performing a coordinate rotation operation on the first coordinate with respect to the first receiving phase angle to obtain the eighth component of the third coordinate.
5. The touch controller of claim 2, wherein the demodulation module is configured to perform operations on the fifth component and the sixth component based on the first component, the second component, the third component, and the fourth component to calculate the first amplitude corresponding to the first phase and the second amplitude of the second phase in the third received signal:
forming a decoding matrix according to the first component, the second component, the third component and the fourth component:
Forming a first vector according to the fifth component and the sixth component;
multiplying the decoding matrix by the first vector to obtain a second vector; and
the first amplitude and the second amplitude are obtained from a second vector.
6. The touch controller of claim 5, wherein the decoding matrix is proportional to
7. The touch controller of claim 2, wherein the first component is an in-phase component of the first received signal, the third component is an in-phase component of the second received signal, the fifth component is an in-phase component of the third received signal, the second component is a quadrature component of the first received signal, the fourth component is a quadrature component of the second received signal, and the sixth component is a quadrature component of the third received signal.
8. The touch controller of claim 2, wherein the first component is a component of the first received signal corresponding to the first phase, the third component is a component of the second received signal corresponding to the first phase, the fifth component is a component of the third received signal corresponding to the first phase, the second component is a component of the first received signal corresponding to the second phase, the fourth component is a component of the second received signal corresponding to the second phase, and the sixth component is a component of the third received signal corresponding to the second phase.
9. A demodulation method applied to a touch controller in a touch system, the touch controller including a signal generating module and a demodulation module, wherein the signal generating module is coupled to a plurality of transmitting electrodes of a touch panel, and the demodulation module is coupled to a plurality of receiving electrodes of the touch panel, the demodulation method comprising:
in the pre-stage, the signal generating module outputs a first transmission signal to a first transmission electrode of a plurality of transmission electrodes of the touch panel at a first time, and does not output any signal to other transmission electrodes except the first transmission electrode of the plurality of transmission electrodes;
the demodulation module receives a first receiving signal of a receiving electrode in a plurality of receiving electrodes of the touch panel at the first time and generates a first component and a second component corresponding to the first receiving signal, wherein the first component and the second component are related to a phase between the first transmitting electrode and the receiving electrode;
the signal generating module outputs a second transmission signal to a second transmission electrode of the plurality of transmission electrodes at a second time, and does not output any signal to other transmission electrodes except the second transmission electrode of the plurality of transmission electrodes;
The demodulation module receives a second received signal of the receiving electrode at the second time and generates a third component and a fourth component corresponding to the second received signal, wherein the third component and the fourth component are related to the phase between the second transmitting electrode and the receiving electrode;
in the touch detection stage, the signal generation module outputs the first transmission signal to the first transmission electrode and simultaneously outputs the second transmission signal to the second transmission electrode, wherein the first transmission signal has a first phase, the second transmission signal has a second phase different from the first phase, and the frequencies of the first transmission signal and the second transmission signal are the same; and
the demodulation module receives a receiving signal of one receiving electrode in the plurality of receiving electrodes, and calculates a first amplitude corresponding to the first phase and a second amplitude corresponding to the second phase in the receiving signal according to the receiving signal in the touch detection stage; the first amplitude is used for judging the capacitance between the first transmitting electrode and the receiving electrode, and the second amplitude is used for judging the capacitance between the second transmitting electrode and the receiving electrode.
10. The demodulation method of claim 9, further comprising:
in the touch detection stage, the signal generating module outputs the first transmission signal with a first phase to the first transmission electrode at a third time and simultaneously outputs the second transmission signal with a second phase different from the first phase to the second transmission electrode;
the demodulation module receives a third received signal of the receiving electrode at the third time and generates a fifth component and a sixth component corresponding to the third received signal; and
the demodulation module calculates the fifth component and the sixth component according to the first component, the second component, the third component and the fourth component to calculate the first amplitude corresponding to the first phase and the second amplitude of the second phase in the third received signal.
11. The demodulation method of claim 10 wherein the step of computing the fifth component and the sixth component based on the first component, the second component, the third component, and the fourth component to calculate the first amplitude corresponding to the first phase and the second amplitude corresponding to the second phase in the third received signal comprises:
Calculating a first receiving phase angle corresponding to the first transmitting electrode and the receiving electrode according to the first component and the second component;
calculating a second receive phase angle corresponding to between the second transmit electrode and the receive electrode according to the third component and the fourth component;
the fifth component and the sixth component form a first coordinate;
performing a coordinate rotation operation on the first coordinate with respect to the second receiving phase angle to obtain a seventh component of a second coordinate, wherein the seventh component is a component of the second coordinate in a first dimension;
performing a coordinate rotation operation on the first coordinate with respect to the first receiving phase angle to obtain an eighth component of a third coordinate, wherein the eighth component is a component of the third coordinate in a second dimension, and the first dimension is orthogonal to the second dimension; and
the first amplitude is obtained from the seventh component, and the second amplitude is obtained from the eighth component.
12. The demodulation method of claim 11 wherein the step of computing the fifth component and the sixth component based on the first component, the second component, the third component, and the fourth component to calculate the first amplitude corresponding to the first phase and the second amplitude corresponding to the second phase in the third received signal comprises:
Calculating the first receiving phase angle corresponding to the first transmitting electrode and the receiving electrode according to the first component and the second component by using a coordinate rotation digital algorithm;
calculating the second receive phase angle corresponding to between the second transmit electrode and the receive electrode from the third component and the fourth component using the coordinate rotation digital algorithm; performing a coordinate rotation operation on the first coordinate with respect to the second reception phase angle using the coordinate rotation digital algorithm to obtain the seventh component of the second coordinate; and
and performing coordinate rotation operation on the first coordinate relative to the first receiving phase angle by using the coordinate rotation digital algorithm to acquire the eighth component of the third coordinate.
13. The demodulation method of claim 10 wherein the step of computing the fifth component and the sixth component based on the first component, the second component, the third component, and the fourth component to calculate the first amplitude corresponding to the first phase and the second amplitude corresponding to the second phase in the third received signal comprises:
Forming a decoding matrix according to the first component, the second component, the third component and the fourth component:
forming a first vector according to the fifth component and the sixth component;
multiplying the decoding matrix by the first vector to obtain a second vector; and
the first amplitude and the second amplitude are obtained from a second vector.
14. The demodulation method of claim 13 wherein the decoding matrix is proportional to
15. The demodulation method of claim 10, wherein the first component is an in-phase component of the first received signal, the third component is an in-phase component of the second received signal, the fifth component is an in-phase component of the third received signal, the second component is a quadrature component of the first received signal, the fourth component is a quadrature component of the second received signal, and the sixth component is a quadrature component of the third received signal.
16. The demodulation method of claim 10, wherein the first component is a component of the first received signal corresponding to the first phase, the third component is a component of the second received signal corresponding to the first phase, the fifth component is a component of the third received signal corresponding to the first phase, the second component is a component of the first received signal corresponding to the second phase, the fourth component is a component of the second received signal corresponding to the second phase, and the sixth component is a component of the third received signal corresponding to the second phase.
17. A touch system, comprising:
a touch panel, comprising:
a plurality of transfer electrodes; and
a plurality of receiving electrodes; and
a touch controller, wherein the touch controller is the touch controller of any one of claims 1-8.
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| PCT/CN2018/075195 WO2019148480A1 (en) | 2018-02-05 | 2018-02-05 | Touch controller, demodulation method and touch control system |
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| DE112017008197T5 (en) * | 2017-12-18 | 2020-07-30 | Mitsubishi Electric Corporation | Display control device, display system, display device, display method and display program |
| US11614839B2 (en) * | 2020-08-20 | 2023-03-28 | Apple Inc. | Balanced mutual capacitance systems and methods |
| US11409396B1 (en) * | 2021-05-03 | 2022-08-09 | Synaptics Incorporated | Transcapacitive sensing with consideration of capacitive couplings from non-adjacent electrodes |
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